SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '30e09a7cfba59796ab3635b1b2f399f9d0e63542e6bfc15ee954653a981d1aca' 
  AND token = 'RWQIFvMcvju/jp+hnjj2EoyiJO1sFHIK+/JYieKZ7aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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