SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e33dc9de609433309e7ecc8d25fed92dc9da073f4a4e60f51594e6eb5a7ffb8' 
  AND token = 'WRJGkiHwWjGqYh0/4aKVmw05vRMkkV16yxFsrS/318Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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