SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d8927790ec561505fe98da3529404d6c30a533085eab4f960ccb079a2731c6f' 
  AND token = 'Xcqmy+tl0tniOIeDhZ2Yxvy1ZImYqq7bFCmFVZPRSjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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