SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b9d99ff5752f984f858ca1a265f951e0a31c4ea97b506c442a4d0c1af3a748d' 
  AND token = 'dCRY9JV3/WFCrUU33IdqgRk2hGMCNFuJ5oRJ62udJCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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