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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a653a4a81699820e73ca8bac48a10a7ecb17f64086485569ab08c418119222a9' 
  AND token = 'kZCI9P5edU6OQs0s3d/Bs9Rs8kPfJHwmm/C4Bo+QjlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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