SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8542397b17327a73f11e59366aab9583ff30da5a76652f0cdbf10c41bae982b4' 
  AND token = 'oNtcAqh5BGaa64SF7wFCqZDWB0RtJBd4Xa4QgOVw4Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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