Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e512ffb372ecbf913479cca608e137f8fd7ad8efd9d0c6ffc3a50cb652196250' 
  AND token = 'wMLJ7IoUTEg7YgaAkdD9y0MZ2NfcJ3Ax71cijDTda7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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