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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7200f10e411d734fbb2c82145dbf665109ae9ee41856ecbe7e1b31042c11de4' 
  AND token = 'KsVBeJGUY9elOB/sMFL3Qc09IU2Csmtpsa1bSP6QDhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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