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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '592fb9670056330d6932b7d9b417fa20949cc67f7c4fb8895702ba4928853ca8' 
  AND token = 'VXCbMmyZI/8J2Bmbn0VAFFm8c7kgF29hzrhxI9TW5EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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