SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a36dd3a6c3880d3a4fdb4b79198f6d17435604e0709254bae87c27e696942db9' 
  AND token = 'JYLwIuhZvyB/QKEHH0xPEr98kAicRnJE6oQiYV+iXLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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