SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0dde17c837627e5702747b30a4741790d9b354928fe3c78aa22fae8028b7a0e0' 
  AND token = 'LxAOz/QwgZgi+rI+EPveRFWGFQUz8g2Lxnn751JjZJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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