SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39384c298ba1695ba73c63ca0518fb746234edd4e7e9dbaf053c70544f370674' 
  AND token = 'zhPgHgJ5d2lwWQgPGweL8Jp0qVFuH8TyW6D1Zlt0xgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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