SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5954f0e22f85704c7b07d772425dd763013810b9957bc76c29157d06f53f1f05' 
  AND token = 'hdLuKSydChvKSGBUtqxemsP/YP1GxiBjzIZELC5oBE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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