SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07b55ddaa6e750b25fcc757133f407453cf21b627394df3a8a4a1b28de7b323b' 
  AND token = 'ZFng6toezLtd7XJdvhfr6GdI/+uj5KhJtxAXJcdhyLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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