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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9da5aef4fc5f4e4e63624a58dffa69e245852302bfd9ef0d73e7f37c5d4f546' 
  AND token = 'L/M6iSdDlr6TMTs8F6m/mCtX0/OWA7g9IazqJEw8ltM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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