SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d573baae669266c240af94f333e2a5d924530c4857fe465e9e4bf958c40dcac' 
  AND token = 'onyeq3qUjMzZeQjBDg94pvGR4Q7qbgC84Xtuqqh+M+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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