SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df15897b82d184b12fb95b7b0f1a00303a0dc47a203ef27a2d8de905f0425606' 
  AND token = 'G4AZ5d+xGhz9zA84TgZz252iqJYROAVCpkM3Zp6OHso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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