SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '141efd5cf8dd83e9a4ab151fc4bdbf2ffe8123a6368eca2c8e62785107b1dacf' 
  AND token = 'OVqEmhE+ipvm57D+DtPeKE/zqe39+YicFQIDBLy4BVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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