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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f4b4e9f626357e26c1e3c55158bfd053f76c86aaf437792ed6538fb969f4c94' 
  AND token = 'W5/00evBgBCb3xmfNM3s641R7MCkIfOsddwJg6Xexh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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