SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '774950178e06ff86196fc165f0a4adb8b38ed2b3e8b9dbc34adbbe1e895fe654' 
  AND token = 'jVR4hqGwBL4cZtuWPkFoIBNj/laFuLRselv/0knX2hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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