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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a84910fe29db5e9d7d185a27b073e66bd2b6a4d9c366e3cc77d6023ee123071a' 
  AND token = '6Pr/ckB9i6QdBIDC00jMPfYcJU1wUnmoCARQUvIBLqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}