SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a73656304282753376057557e2793f0255e2bf5e74a0b52dbf1c221399e12db2' 
  AND token = '+P8xhrfLE3ZBHIhR88qKE5juVP+zfKo0/lL9KsFCgJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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