SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e566286bbbb7d9a98ffc8214bbb5f46611c8e3409ade7f971d063eb58ecfb4be' 
  AND token = 'HjhSPyEQP/JFuGC/xfzG3CG01e4AP+cWUJOfS6QwCVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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