SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89c78718e93238fe27ab557bbeede456194d0e03790ea7b8118d821bcd93e8da' 
  AND token = 'nxAhm/vuVzJSNsZ4nsDp8Gt7j3ZkgYcb+X/S6Y1/Ww4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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