SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea0133f9247942c608a8820bea379c4ea7fd422b1d8e202a88aaed101af50baf' 
  AND token = 'fCiyVcKmuoThIaPGCX6V0+sUUzF2XKm7hqFn7z/ev9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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