SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '916710030b11e8f783780e91a5154037d8216b171ec217595f680561b6f95ce5' 
  AND token = 'KqLY3B5XVnlyojxqg6ZH18m6B695CPTlPaNJnbshjQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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