SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a4865ff56332173206fc28227a0b26184b8bd98f970c5c42c8e60b132f307b3b' 
  AND token = '9jFOnIUs3k4GjnNnvcJ8JZA4VpwZ7NojLxcVCuAM7ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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