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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd49d0705bb511d7e4e3072958e4df675765ed3488553f3710ab5d1b95b8791d8' 
  AND token = '68CaLMY11VqKIYi27edEBtpJ1ojCW7fZtaTw4IqS0fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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