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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ee278dc5d64e0f9c4e161e2cccefd0ba82de58620ba278838c3741c93ab1c28' 
  AND token = 'WAxMeMoo0ZV1oFlFZf0NwKHwqYk7kYABuqKrw7mWmII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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