SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de26b086ed74e6078e096b434d8df007eb509f876f5fef5a8df64bbb3f5e9a55' 
  AND token = 'jBphHDuIXg8ytvpj+o4mQEnUrLzdT9o2/zByJaFegsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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