SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3d37709646c437cb95faf925a40742dd05522281c57de07ab2a458a03c4b492' 
  AND token = 'ZtIlxJjvd4Aa/rs18zDGIM8Z6IvYURBYIMbhVKt+PR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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