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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f21672f2b883e0e9aaac79d77b294a9cc8f1f17ead309cb10b3905e72350a5fc' 
  AND token = 'ILmmymF03hbV3JVtbBDQFf3+GsBQhXyvDvH7CQVblYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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