SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4608551fad03faf1e60c62dde6ae5bd4be6cea35cb346d427a6c218f30a26deb' 
  AND token = '7vHXO/9BDY4OMYp7BkQkGPzzYgInYYOvwKLsFmZtfMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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