SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92f63dd6ed89fc79a75e85df09cda9c6e438ce82b4965877beacacc52db4ebfb' 
  AND token = 'PBv6pd3JiKGVz44yXPTgqomxm7BE6ZAWDyVycUVY4xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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