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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85eecb23500ddca064d5ebe14daf5e4ad5ddb669dd0b61e3bbadeb105d52e4fa' 
  AND token = '8KkPUQHU+eXnDmmAfOY6yYgQ4w4STZu195PuJUakKWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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