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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b19fd9c5be612d674935ed6f75683d5d5f00117f1ab091eeab421553bc53a6c8' 
  AND token = 'yMBkyi66zYY9G5YBfWtAC8DYB4xlf9Znc4+zTPNroQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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