SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bed7d9b1ef0330ba497fe72c370a525586b4653085a012b9f713195fd62bca7' 
  AND token = 'C+V+8u/J8kPqbTb71eqi2moS9oZKU4jTjKks1kqswxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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