SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9dff32ac93dad4a3dc7d9a04d7260cd3052388823cf75ecb452e30607f0679f' 
  AND token = 'KrCp0UUcaJUq4HvJw3js+Dj9LG5GcVvylET5SsczPoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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