SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07a55dda899677576b113d0db5cdb1406a42a76bb04eaef430f691bbf8f9deb7' 
  AND token = 'meKIvckZr/QhwzvzqUuIHfsiA+LY7lH7AqmUodEEgnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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