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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d43f80b048b058d97a7fd7f4552a9dcfe34b48955258280d168393c598d5f95' 
  AND token = 'xfVXCjXlpgTH7U1L0u0Oo4UiTgpOE96aG9rCXsDQQ3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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