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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42458eef2feefb44e6809bd8b67fd3966eed7c7d8fa6ec5df9b57a2331ec7dbf' 
  AND token = 'rAxrJ20TOGgNibIeqqIisw64H4HQUSLU4my6QPhk5rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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