SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10be84493d7cd5b86537a6a87a9d41b44d3d40c5722e92ffb83084b67d2f8200' 
  AND token = 'y64bXc80LT7FQPozj6CYEvluthOZgvLUXz6rTPBUvjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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