Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1acdf598f1e93215c7eb908f63a3cbcaa4c3837a2ee33dbdcdeebee078084d4' 
  AND token = 'xz6zp4dlQ0VaY1HsMXt2CLRgNbkmTuCXfY1fFetm8YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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