SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '519ae64b98cdbca8a4a3e0d4919cc321f4615b0f42f7386eb88c2c81e4293601' 
  AND token = 'yWYJF0e4InLtLOavKADg5OWn7drWQxY97nmBwrFfhVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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