SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fd2605d2220891e690a2b35e2ab5237514675279edbb6d867270d8acc1bcc50' 
  AND token = 'LMrpjHAYy8vIBVwmzhmGYBK2n2OHptxMWwqGI3P51c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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