Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '320652bb237c9944a422bfa888356ad72e484535ed119c6750f6a33767f4f86f' 
  AND token = 'COKwUbMghywffvdWcPX0aDOQE6PMxo3TWc53+X7lvBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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