SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76c48de1797fa2569618f440c010d8ef398b9f5b18c1b9bd626dabc5c836a5dc' 
  AND token = 'TIop92XpTs72YVFZZMFuzx1mdDDgDihNn0Qmj2Ov0ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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