SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b141c824b2789348c59b05027adb3160858f2ae5a4f6b786973d724094a9fed6' 
  AND token = 'iCEJBzNFbQdFLouSDdRX53j+w8p26tQfY0ujCqBrl6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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