SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb358596472ecb434cbd8348c83011416242410a91902fc9da1455c342a62a5f' 
  AND token = 'xVM2PqbTKDJ9HCHFf8wUCXKKoSoA0agBZZk4nivSyDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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