Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1320f2d257db3c7c7fc4644ae5e31b78fd6be787d5797f4b4ffd11fa2f3b8a8a' 
  AND token = 'uw8duFRxgKnU66JEFXifkoRnOhDU68DwYqxKGaT0yxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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