SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e68c159ad7020a6b828da9b978260b0fe0fcdf58959902d11a7b41d7ac014f7' 
  AND token = '1suyjLnGbfAajDbzvrwBmuBWzjvJNhwGK+xepoZ3gEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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