SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b212553739d7c5d8975ee3061a77cd16069ec6430ac049c44802e4bb9734ca71' 
  AND token = 'Lop5P44fKFTojoaxGpPuBY+J9Eho3zAYeJq9ygdqdlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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