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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc9e2bf9393f93ebf82f5933c7889a88a49ca02c5ff21b6e794992664c1a94f7' 
  AND token = 'ihgdEPirGh+lg4s6LZRS2A9s+s2YWPMlwWKbwR9lJCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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