SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe2dc6c664a778b80f5b9dbda180a84038b07f12faba2b865b2cc29522136d6f' 
  AND token = 'kPYY2T9shsEHqcaBx/3yzufoIDkjw+wVYOUw2SwylBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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