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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '348ff57c61d09ed50a8108ebd86371f0bf0aab7d5c7151082ac9371ca41e8ec3' 
  AND token = 'a2zY8604VqodhlSDP+cnumwqmyIfAxS3kZ9RzDO8zHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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