SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13298cbe9ee98df08432938a6e3524ae27a66022ef796b415145a777169ba47d' 
  AND token = 'Y9FRzHYYBJSqSLMEYx5nIrGQB5nPSRTGTV0RCqhy4/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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