Decoding AES with Base64 cyphertext and key
Yes, it is AES. The ciphertext decrypts to

user: part4, password: 97531
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PS: after some experiments I was able to decrypt it using the OpenSSL command line:

openssl enc -d -aes-128-ecb -in cipher.txt -out plain.txt -nopad -nosalt -K 10EABCFF45E05EBB7AF9A228DD31F216 -iv 0 -base64


I converted the key from base64 to hex first.