SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6b4ffa2ad7119603ce8cb2a60bac55b50d9a374646fb3f8408af2c958b7922b' 
  AND token = 'UU6qIRc7kipyQw0/G+izup/PkG6B6/J+MfK6SLgVdu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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