SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b13711245bd47efa4b40f9d8240f2e73bb775623313d0a3e0948bc0597a5a5ad' 
  AND token = 'z/wLQkr7A94dqZJhUbzfwdUGGmrvJKp6DuYRPyrbS+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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