SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '215a03e07c6bf411104bc41a31ea03e76f59e04879f6ba2c31c4332661f865ca' 
  AND token = 'DhCDgAoa8NZ8+ujN5wIvJdvFn+iC9LU6Bl70LipVtXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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